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SubjectRe: [PATCH V3] sched/rt, powerpc: Prepare for PREEMPT_RT
Date
Wang Qing <wangqing@vivo.com> writes:
> PREEMPT_RT is a separate preemption model, CONFIG_PREEMPT will
> be disabled when CONFIG_PREEMPT_RT is enabled, so we need
> to add CONFIG_PREEMPT_RT output to __die().
>
> Signed-off-by: Wang Qing <wangqing@vivo.com>

Something fairly similar was posted previously.

That time I said:

I don't think there's any point adding the "_RT" to the __die() output
until/if we ever start supporting PREEMPT_RT.

https://lore.kernel.org/linuxppc-dev/87d0ext4q3.fsf@mpe.ellerman.id.au/


And I think I still feel the same way. It's not clear powerpc will ever
support PREEMPT_RT, so this would just be confusing to people. And
potentially someone will then send a patch to remove it as dead code.

cheers



> diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
> index 5006dcb..dec7b81
> --- a/arch/powerpc/kernel/traps.c
> +++ b/arch/powerpc/kernel/traps.c
> @@ -262,10 +262,11 @@ static int __die(const char *str, struct pt_regs *regs, long err)
> {
> printk("Oops: %s, sig: %ld [#%d]\n", str, err, ++die_counter);
>
> - printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s %s\n",
> + printk("%s PAGE_SIZE=%luK%s%s%s%s%s%s%s %s\n",
> IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN) ? "LE" : "BE",
> PAGE_SIZE / 1024, get_mmu_str(),
> IS_ENABLED(CONFIG_PREEMPT) ? " PREEMPT" : "",
> + IS_ENABLED(CONFIG_PREEMPT_RT) ? " PREEMPT_RT" : "",
> IS_ENABLED(CONFIG_SMP) ? " SMP" : "",
> IS_ENABLED(CONFIG_SMP) ? (" NR_CPUS=" __stringify(NR_CPUS)) : "",
> debug_pagealloc_enabled() ? " DEBUG_PAGEALLOC" : "",
> --
> 2.7.4

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